Iivalvu ze-slab zizinto ezibalulekileyo kwiinkqubo ezahlukeneyo zemizi-mveliso, ngakumbi ezo zibandakanya ukulawula ukuhamba kolwelo okanye iigesi.Ezi zivalo zisetyenziswa kwizicelo ezininzi ezahlukeneyo, kubandakanywa ukuveliswa kweoli negesi, ukusetyenzwa kweekhemikhali, kunye nonyango lwamanzi ....
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